CN211781060U - Low nitrogen oxide combustor and gas heater - Google Patents

Abstract

The utility model relates to a low nitrogen oxide combustor and gas heater, low nitrogen oxide combustor include interior casing and shell. The inner shell is provided with an injection channel, a light flame shunting channel and a light flame mixing cavity; two dense flame mixing cavity profiling molds protruding outwards are arranged on the shell; the outer shell is sleeved on the outer side of the inner shell, and two thick flame mixing chambers communicated with the injection channel are formed between the inner wall of the two thick flame mixing chamber profiling molds and the outer wall of the light flame mixing chamber respectively. The utility model discloses can effectively realize reducing nitrogen oxide and discharge. Because only one injection channel is adopted, only one gas nozzle is adopted in specific use, and the reliability is high compared with the adoption of a plurality of injection channels and a plurality of corresponding gas nozzles; because mainly adopt two parts of interior casing and shell and construct with embedded cooperation mode, the part is less relatively, and the structure is simple relatively, and then simplifies production technology.

Description

Low nitrogen oxide combustor and gas heater

Technical Field

The utility model relates to a combustor technical field especially relates to a low nitrogen oxide combustor and gas heater.

Background

In the field of gas water heaters, various large gas water heater manufacturers only reduce the emission of CO at present, and do not pay enough attention to the emission of low nitrogen oxides. Most of the conventional burner technologies are ordinary atmospheric burners, NO_XThe emission of gas (nitrogen oxides) is high, which is not favorable for the low-nitrogen environmental protection emission requirement. At present, the industry adopts a burner of a thick and thin combustion technology to realize low nitrogen oxide emission. However, the conventional burner has double injection channels and a relatively complex structure, and brings many challenges to manufacturing processes, circuit program control, product performance stability and the like.

SUMMERY OF THE UTILITY MODEL

The utility model provides a first technical problem provide a low nitrogen oxide combustor, it can realize low nitrogen oxide effectively and discharge.

The second technical problem solved by the present invention is to provide a gas water heater, which can effectively realize the emission of low nitrogen oxides.

The first technical problem is solved by the following technical scheme:

a low nox burner comprising:

the flame mixing device comprises an inner shell, wherein an injection channel, a light flame shunting channel and a light flame mixing cavity are arranged on the inner shell; the thin flame split-flow passage is communicated between the injection passage and the thin flame mixing cavity, and a plurality of air supply through holes are formed in the wall body of the thin flame split-flow passage; a light flame outlet is formed in the top end face of the light flame mixing cavity;

the shell is provided with two thick flame mixing cavity compression molds protruding outwards, and an opening is formed between the upper ends of the two thick flame mixing cavity compression molds;

the outer shell is sleeved on the outer side of the inner shell, two thick flame mixing chambers communicated with the injection channel are formed between the inner walls of the two thick flame mixing chamber profiling molds and the outer wall of the light flame mixing chamber respectively, and thick flame fire outlets communicated with the thick flame mixing chambers are formed between the periphery of the opening and the periphery of the top of the light flame mixing chamber.

Low nitrogen oxide combustor compare produced beneficial effect with the background art:

when the injection passage works, a gas nozzle can be correspondingly arranged at the gas inlet of the injection passage, the gas nozzle injects gas into the injection passage at certain pressure, and simultaneously air in the atmospheric environment at the gas inlet end of the injection passage is involved and fully mixed to form primary premixed gas; part of the primary premixed gas enters the dense flame mixing cavity, is further fully mixed in the dense flame mixing cavity, and is discharged from the dense flame outlet and is combusted to form a plurality of dense flames; the other part of the primary premixed gas is sent into the light flame mixing cavity through the light flame shunting channel, under the combined action of the blowing or exhausting of the fan and the ejecting of the primary premixed gas, the outside air enters the light flame shunting channel through the air supply through hole, the supplied air and the primary premixed gas are further fully mixed in the light flame shunting channel, and finally enter the light flame mixing cavity and are sprayed out from the light flame outlet to combust to form a plurality of light flames.

That is, the injection passage simultaneously provides air-fuel mixture for the rich flame mixing cavity and the lean flame mixing cavity, the air supply through hole additionally provides supply air for the lean flame mixing cavity, and the air-fuel ratio of the mixture in the lean flame mixing cavity is greater than that of the mixture in the rich flame mixing cavity because the lean flame mixing cavity is more mixed with air than the rich flame mixing cavity, so that the lean flame combustion is correspondingly formed at the lean flame outlet and the rich flame combustion is formed at the rich flame outlet; the light flame is burnt under the condition of excessive air, the light flame is wrapped by the excessive air to reduce the temperature, the thick flame is incompletely burnt under the anoxic condition to reduce the temperature of the thick flame, and the whole flame has a 'thick-light-thick' structure, so that the temperature of the flame is integrally reduced, and the nitrogen oxide NO is further reduced_XThe discharge amount of (c); dense flame mixing chamber andthe light flame mixing chamber can make fuel and air intensive mixing for the fuel burning is more abundant, and simultaneously, the dense flame is located light flame both sides, and the fuel of not intensive burning in unnecessary air and the dense flame in the light flame further burns, thereby guarantees the fuel intensive burning, improves the utilization ratio of fuel when reducing CO and discharging. Thus, the reduction of nitrogen oxide emission can be effectively realized.

The air supply structure is arranged in a through hole mode, various tests of products are facilitated, the aperture and the number of the through holes can be selectively shielded and adjusted in the test process to carry out different tests, and therefore a proper product is designed.

Because only one injection channel is adopted, only one gas nozzle is needed in specific use, and a plurality of injection channels and a plurality of corresponding gas nozzles are adopted relatively, so that the reliability is high.

In one embodiment, the plurality of air supply through holes are circumferentially arranged along the radial direction of the light flame splitting passage.

In one embodiment, the inner shell is provided with a flow deflector which is positioned in the light flame diversion channel and is right opposite to the air supply through hole, and the flow deflector obliquely extends along the air flow direction from one side of the air supply through hole, which is far away from the air outlet of the light flame diversion channel.

In one embodiment, the two dense flame mixing cavity molds are positioned at two opposite sides of the injection channel, and a plurality of dense flame shunting holes communicated with the dense flame mixing cavity are formed in two opposite side walls of the injection channel.

In one embodiment, the housing is further provided with two air supply channel compression molds protruding outwards, the two air supply channel body compression molds are enclosed to form an air supply channel body enclosing the light flame diversion channel, an air inlet of the air supply channel body is communicated with the atmospheric environment, and an air outlet of the air supply channel body is communicated with the air supply through holes.

In one embodiment, the inner shell comprises two light flame diversion channels, and the light flame mixing cavity is provided with two air inlets; the two light flame shunting channels are respectively arranged at two sides of the injection channel and are connected with two air inlets of the light flame mixing cavity.

In one embodiment, the air supply passage body is provided with two air outlets, and the two air outlets are positioned at two sides of the injection passage and are correspondingly communicated with a plurality of air supply through holes of the two light flame diversion passages;

the air supply channel body encloses the injection channel and the light flame diversion channel with a ventilation gap, and is provided with three air inlets which are arranged in sequence, two air inlets positioned at the side parts are positioned at the two sides of the injection channel, and the air inlet positioned at the middle part surrounds the injection channel with a gap; or the like, or, alternatively,

the air supply channel body encloses the light flame shunting channel with a ventilation gap, and is provided with two air inlets which are positioned at two sides of the injection channel; or the like, or, alternatively,

the air supply channel body encloses the injection channel and the light flame diversion channel with a ventilation gap, and is provided with an air inlet which surrounds the injection channel with a gap.

In one embodiment, a plurality of first convex hulls which are convex towards the light flame mixing cavity are sequentially arranged on the top side surface of the thick flame mixing cavity die at intervals along the thick flame fire outlet; a second convex hull protruding towards the light flame mixing cavity is further arranged in the middle of the side face of the thick flame mixing cavity die; a third convex hull is arranged on the inner wall of the light flame mixing cavity and corresponds to the air outlet end of the light flame diversion channel; and more than one fourth convex hull is arranged on the side surface of the top of the light flame mixing cavity.

In one embodiment, the inner shell comprises a fire hole plate arranged at the light flame fire outlet, and the fire hole plate is provided with a light flame fire outlet; the fire hole plate and the wall forming the light flame mixing cavity are of an integrated structure.

In one embodiment, the low nox burner further includes an inner core disposed in the light flame mixing cavity, the inner core is provided with a plurality of gas flow channels extending in the longitudinal direction, the bottom end surface of the gas flow channels is provided with a gas inlet, and the top end surface of the gas flow channels is provided with a gas outlet located at the light flame outlet.

The second technical problem is solved by the following technical solutions:

a gas water heater comprises the low nitrogen oxide burner.

Gas heater, compare produced beneficial effect with the background art: because include low nitrogen oxide combustor, its technical effect by low nitrogen oxide combustor bring, beneficial effect is the same with low nitrogen oxide combustor, do not give unnecessary details.

Drawings

Fig. 1 is a schematic structural diagram of a low nox burner according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a low nox burner according to an embodiment of the present invention with a portion of the area missing;

fig. 3 is a front view of a low nox burner according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view at A-A of FIG. 3;

FIG. 5 is another view of FIG. 3 taken at A-A;

FIG. 6 is a cross-sectional view at B-B of FIG. 3;

fig. 7 is a schematic structural diagram of a portion of a low nox burner according to an embodiment of the present invention;

fig. 8 is another schematic structural diagram of a low nox burner according to an embodiment of the present invention;

fig. 9 is a schematic view of an arrangement structure of a flow deflector according to an embodiment of the present invention;

fig. 10 is a schematic structural view of a low nox burner according to an embodiment of the present invention with a portion of the area missing;

fig. 11 is a schematic structural diagram of a low nox burner according to an embodiment of the present invention;

fig. 12 is a schematic structural view of an inner core body according to an embodiment of the present invention.

Reference numerals:

100. an inner housing; 11. an injection passage; 12. a dense flame splitter orifice; 13. a light flame diversion channel; 131. An air supply through hole; 132. a flow deflector; 14. a light flame mixing chamber; 141. a light flame outlet; 144. A third convex hull; 145. a fourth convex hull; 18. fire hole plates; 181. a light flame fire outlet; 200. an outer housing; 21. profiling a dense flame mixing cavity; 23. a rich flame mixing chamber; 231. a dense flame outlet; 232. a first convex hull; 233. a second convex hull; 24. an air supply passage body; 241. profiling an air supply channel; 300. An inner core body; 301. and a gas flow passage.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the description of the present invention, it is to be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly connected" to another element, there are no intervening elements present.

In one embodiment, referring to fig. 1 to 10, a low nox burner comprises:

the flame mixing device comprises an inner shell 100, wherein an injection passage 11, a light flame diversion passage 13 and a light flame mixing cavity 14 are arranged on the inner shell 100; the injection passage 11 is used for introducing air and fuel gas, the light flame diversion passage 13 is communicated between the injection passage 11 and the light flame mixing cavity 14, namely the injection passage 11 is communicated with the light flame mixing cavity 14 through the injection passage 11, and the wall body of the light flame diversion passage 13 is provided with a plurality of air supply through holes 131; a light flame fire outlet 141 is formed in the top end face of the light flame mixing cavity 14;

the flame mixing device comprises a shell 200, wherein two thick flame mixing cavity molds 21 protruding outwards are arranged on the shell 200, and an opening 22 is formed between the upper ends of the two thick flame mixing cavity molds 21;

the outer shell 200 is sleeved on the outer side of the inner shell 100, two rich flame mixing chambers 23 communicated with the injection passage 11 are respectively formed between the inner walls of the two rich flame mixing chamber molds 21 and the outer wall of the light flame mixing chamber 14, and a rich flame fire outlet 231 communicated with the rich flame mixing chambers 23 is formed between the periphery of the opening 22 and the top periphery of the light flame mixing chamber 14.

When the low-nitrogen oxide combustor works specifically, a gas nozzle can be correspondingly arranged at the gas inlet of the injection passage 11, the gas nozzle injects gas into the injection passage 11 at a certain pressure, and simultaneously air in the atmospheric environment at the gas inlet end of the injection passage 11 is involved and fully mixed to form primary premixed gas; part of the primary premixed gas enters the rich flame mixing chamber 23, is further fully mixed in the rich flame mixing chamber 23, and is discharged from the rich flame outlet 231 and is combusted to form a plurality of rich flames; the other part of the primary premixed gas is sent into the light flame mixing cavity 14 through the light flame shunting passage 13, under the combined action of the blowing or exhausting of the fan and the ejecting of the primary premixed gas, the outside air enters the light flame shunting passage 13 through the air supply through hole 131, the supplied air and the primary premixed gas are further fully mixed in the medium and light flame shunting passage 13, the uniform mixing effect is enhanced by the light flame shunting passage 13, and then the supplied air enters the light flame mixing cavity 14 and is ejected from the light flame fire outlet 141 and is combusted to form a plurality of light flames.

That is, the injection passage 11 simultaneously provides air-fuel mixture for the rich flame mixing chamber 23 and the lean flame mixing chamber 14, the air supply through hole 131 additionally provides supply air for the lean flame mixing chamber 14, and because the lean flame mixing chamber 14 is mixed with more air than the rich flame mixing chamber 23, the air-fuel ratio of the mixture in the lean flame mixing chamber 14 is greater than that of the mixture in the rich flame mixing chamber 23, so that the lean flame combustion is correspondingly formed at the lean flame outlet 141, and the rich flame combustion is formed at the rich flame outlet 231; the light flame is burnt under the condition of excessive air, the light flame is wrapped by the excessive air to reduce the temperature, the thick flame is incompletely burnt under the anoxic condition to reduce the temperature of the thick flame, and the whole flame has a 'thick-light-thick' structure, so that the temperature of the flame is integrally reduced, and the nitrogen oxide NO is further reduced_XThe discharge amount of (c); the rich flame mixing chamber 23 and the light flame mixing cavity 14 can fully mix fuel and air, so that the fuel is more fully combusted, meanwhile, the rich flame is positioned on two sides of the light flame, and redundant air in the light flame and the insufficiently combusted fuel in the rich flame are further combusted, so that the fuel is fully combusted, the CO emission is reduced, and the utilization rate of the fuel is improved. Thus, the reduction of nitrogen oxide emission can be effectively realized.

The air supply structure is arranged in a through hole mode, various tests in the research and development process are facilitated, the aperture and the number of the through holes can be selectively shielded and adjusted in the test process to carry out different tests, and therefore a proper product is designed.

Because only one injection channel 11 is adopted, only one gas nozzle is needed in specific use, and a plurality of injection channels 11 and a plurality of corresponding gas nozzles are adopted relatively, so that the reliability is high.

Because mainly adopt two parts of interior casing and shell and construct with embedded cooperation mode, the part is less relatively, and the structure is simple relatively, and then simplifies production technology.

The term "a number" as used herein means two or more in number.

The through holes can be in a circular shape, a rectangular shape or other shapes, and the shapes of the through holes can be partially the same, totally the same or different.

Further, the plurality of air supply through holes 131 are circumferentially arranged along the radial direction of the light flame diversion passage 13. This scheme can make the air follow different angles, relatively evenly get into in the light flame reposition of redundant personnel passageway 13 for the air more fully contacts and mixes with once premixing gas.

Further, referring to fig. 9, the inner casing 100 is provided with a flow deflector 132 located in the light flame diversion channel 13 and directly opposite to the air supply through hole 131, and the flow deflector 132 extends obliquely in the air flow direction from the side of the air supply through hole 131 far away from the air outlet of the light flame diversion channel 13. The scheme effectively prevents primary premixed gas in the light flame diversion channel 13 from leaking outwards in the process of entering the gas inlet of the light flame mixing cavity 14.

In an embodiment, referring to fig. 4 and 5, two thick flame mixing cavity molds 21 are located at two opposite sides of the injection passage 11, and a plurality of thick flame shunting holes 12 communicating with the thick flame mixing cavity 23 are respectively formed on the two opposite side walls of the injection passage 11. This scheme does benefit to compact structure, material saving.

Of course, from a design point of view, the injection passage 11 may not extend between the two rich flame mixing chambers 23, and the rich flame split portion is provided in a passage manner.

Further, referring to fig. 3, fig. 5 and fig. 8, the housing 200 is further provided with two air supply channel pressing molds 241 protruding outward, the two air supply channel body pressing molds 241 surround to form an air supply channel body 24 enclosing the light flame diversion channel 13, an air inlet of the air supply channel body 24 is communicated with the atmospheric environment, and an air outlet of the air supply channel body 24 is communicated with the plurality of air supply through holes 131. 24, the air inlet of the air supply channel body 24 is communicated with the atmosphere, and the air outlet of the air supply channel body 24 is communicated with the plurality of air supply through holes 131. Therefore, on one hand, a certain amount of supply air can be supplemented into the light flame mixing cavity 14 through the air inlet of the air supply channel body 24; on the other hand, the primary premixed gas in the light flame diversion channel 13 can be effectively prevented from leaking outwards in the process of entering the gas inlet of the light flame mixing cavity 14; and the structure of this scheme is simple relatively, easy to carry out, and the space occupation is relatively less.

Further, referring to fig. 3, fig. 5 and fig. 8, the inner housing 100 includes two light flame diversion passages 13, the light flame mixing cavity 14 is provided with two air inlets, and the air outlet ends of the two light flame diversion passages 13 and the two air inlets of the light flame mixing cavity 14 are respectively disposed at two sides of the injection passage 11. Naturally, one the end of giving vent to anger of light flame reposition of redundant personnel passageway 13 with an air inlet of light flame mixing cavity 14 corresponds the setting, so, draws the two air inlets that the primary premixed gas in the passageway 11 of penetrating flows into light flame mixing cavity 14 respectively through two light flame reposition of redundant personnel passageways 13 to finally enter into light flame mixing cavity 14, can be favorable to supplying air and the abundant homogeneous mixing of primary premixed gas. In addition, the number of the light flame diversion channel 13 and the number of the air inlets of the light flame mixing cavity 14 are one, three or more, which is also a feasible scheme.

For the solution having two light flame diversion passages 13, in an embodiment, referring to fig. 3, 5 and 8, the air supply passage body 24 has two air outlets, and the two air outlets are located at two sides of the injection passage 11 and are correspondingly communicated with the air supply through holes 131 of the two light flame diversion passages 13. In general, in terms of design, the air supply passage body 24 is arranged to enclose the injection passage 11 and the light flame diversion passage 13 with a ventilation gap, and a circulation space of air is formed outside the injection passage 11 and the light flame diversion passage 13 by using the air supply passage body 24.

As to the arrangement scheme of the air inlets of the air supply passage body 24, in an embodiment, referring to fig. 10, the air supply passage body 24 encloses the injection passage 11 with a ventilation gap, and is provided with three air inlets arranged in sequence, two air inlets located at the side portions are located at two sides of the injection passage 11, and an air inlet located at the middle portion surrounds the injection passage 11 with a ventilation gap.

In another embodiment, referring to fig. 3, 5 and 8, the air supply passage body 24 encloses the injection passage 11 with a ventilation gap, and is provided with two air inlets, which are located at two sides of the injection passage 11.

In another embodiment, the air supply channel body 24 encloses the injection channel 11 with a ventilation gap, and only one air inlet may be provided, which surrounds the injection channel 11 with a ventilation gap.

Further, referring to fig. 1 to 5, a plurality of first convex hulls 232 protruding toward the lean flame mixing cavity 14 are sequentially arranged on the top side surface of the rich flame mixing cavity die 21 at intervals along the rich flame outlet 231. Therefore, the first convex hulls 232 can effectively divide the rich flame fire outlet 231 into a plurality of spaced rich flame fire outlet holes, so that the shape and the size of the rich flame are effectively ensured, and the combustion stability of the rich flame is ensured.

In one example, referring to fig. 1 to 5, a second convex hull 233 protruding toward the lean flame mixing cavity 14 is further provided on a middle portion of a side surface of the rich flame mixing cavity die 21. Thus, after the premixed gas in the injection passage 11 flows into the rich flame mixing chamber 23 through the rich flame diversion part 12, under the guiding and diversion effect of the second convex hull 233, the premixed gas is diverted to both sides of the second convex hull 233, is further uniformly mixed in the flowing process, and is finally discharged from the rich flame fire outlet 231 for combustion, that is, the second convex hull 233 can enable the discharge flow rates of the premixed gas at all parts of the rich flame fire outlet 231 to be basically the same.

In one example, referring to fig. 5 and 8, the inner wall of the light flame mixing chamber 14 is provided with a third convex hull 144. The third convex hull 144 is disposed corresponding to the gas outlet end of the light flame diversion channel 13. Thus, in the flowing process of the premixed gas in the light flame shunting passage 13, under the guiding action of the third convex hull 144, the flow velocity of the premixed gas changes, and is further uniformly mixed in the flowing process, and finally is discharged from the light flame fire outlet 141 for combustion, that is, the third convex hull 144 can make the discharge flow velocity of the premixed gas at each part of the light flame fire outlet 141 basically the same.

In one example, referring to fig. 5 and 8, more than one fourth convex hull 145 is disposed on the top side of the light flame mixing chamber 14. In this manner, the fourth convex hull 145 facilitates more uniform mixing of the premixed gas within the lean flame mixing cavity 14.

Referring to fig. 7, generally, the light flame diversion channel 13 and the rich flame diversion holes 12 are sequentially disposed on the wall of the injection channel 11 along the airflow direction of the injection channel 11, and the flow area of the light flame diversion channel 13 is larger than the flow areas of the rich flame diversion holes 12, so that the primary premixed gas flows to the light flame mixing cavity 14 providing the main flame better.

In one embodiment, referring to fig. 4 and 5, the inner housing 100 includes a fire hole plate 18 disposed at the light flame outlet 141, and the fire hole plate 18 is provided with a light flame outlet 181. The fire orifice plate 18 is integral with the wall forming the lean flame mixing chamber 14. Thus, the fire hole plate 18 can effectively divide the light flame fire outlet 141 into a plurality of spaced light flame fire outlet holes 181, thereby effectively ensuring the shape and size of the light flame and ensuring the combustion stability of the dense flame.

In an embodiment, referring to fig. 11 and 12, the low nox burner further includes an inner core 300 disposed in the light flame mixing cavity 14, the inner core 300 is provided with a plurality of gas channels 301 extending in a longitudinal direction, the longitudinal direction is a direction in which the bottom of the inner shell 100 points to the top, a bottom end surface of the gas channels 301 is provided with a gas inlet, and a top end surface of the gas channels 301 is provided with a gas outlet located at the light flame outlet 141. Therefore, the air-fuel mixture in the light flame mixing cavity 14 is respectively output outwards through the plurality of gas flow channels 301 of the inner core body, the mixture is divided, the combustion noise is reduced, and the light flame combustion effect is good.

In an embodiment, the low nox burner is a catalytic burner with an additional catalyst, and the catalytic burner is a combustion device or combustion equipment using a catalyst, and the operating principle of catalytic combustion is to make organic waste gas undergo flameless combustion at a lower ignition temperature by means of the catalyst, so that the organic waste gas is decomposed into nontoxic carbon dioxide and water vapor, the catalyst has the function of reducing activation energy, and simultaneously the surface of the catalyst has an adsorption function, so that reactant molecules are enriched on the surface, the reaction rate is increased, and the reaction is accelerated. Compared with the traditional burner, the catalytic burner needs less auxiliary fuel, has low energy consumption and small volume of equipment and facilities, is favorable for further reducing the generation of nitrogen oxides, and is more environment-friendly.

In one embodiment, a gas water heater comprises the low nitrogen oxide burner of any one of the above embodiments.

The gas water heater comprises the low nitrogen oxide combustor, the technical effect of the gas water heater is brought by the low nitrogen oxide combustor, and the beneficial effects of the gas water heater are the same as those of the low nitrogen oxide combustor, so that the description is omitted.

It should be noted that: as described herein, "light flame combustion" and "rich flame combustion" are relative terms in that the fuel-to-air equivalence ratio required for "light flame combustion" and "rich flame combustion" deviates from the normal equivalence ratio. I.e. the same gas quantity, the "light flame combustion" requires a larger air quantity, while the "rich flame combustion" requires a smaller air quantity.

In order to reduce NOx emission, experiments verify that when the primary air coefficient (primary air coefficient of an injection channel) of the rich flame is equal to 0.5-0.6, the NOx amount generated by the rich flame is low, mainly because the primary air is insufficient, the combustion is in an incomplete state, the combustion temperature is low, the generation of NOx is not facilitated, meanwhile, the fuel which is not completely combusted can be subjected to secondary combustion through air supply, and the generation of CO is effectively controlled; when the primary air coefficient of the light flame is 1.6, because oxygen is rich in the primary combustion process of the fuel, the heat released by the fuel combustion is taken away by redundant air and discharged outdoors, so that the combustion temperature of the light flame is lower, the combustion of the thick flame is stable, the light flame can be effectively prevented from leaving the flame, and the stable combustion of the combustor is ensured.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (11)

1. A low nox burner, comprising:

the flame-retardant composite pipe comprises an inner shell (100), wherein an injection passage (11), a light flame shunting passage (13) and a light flame mixing cavity (14) are arranged on the inner shell (100); the injection passage (11) is used for introducing air and fuel gas, the light flame diversion passage (13) is communicated between the injection passage (11) and the light flame mixing cavity (14), and the wall body of the light flame diversion passage (13) is provided with a plurality of air supply through holes (131); a light flame fire outlet (141) is formed in the top end face of the light flame mixing cavity (14);

the flame mixing device comprises a shell (200), wherein two thick flame mixing cavity compression molds (21) protruding outwards are arranged on the shell (200), and an opening (22) is formed between the upper ends of the two thick flame mixing cavity compression molds (21);

the shell (200) cover is located the outside of interior casing (100), form respectively between the inner wall of two dense flame mixing chamber die mould (21) and the outer wall of light flame mixing cavity (14) with draw two dense flame mixing chamber (23) that penetrate passageway (11) intercommunication, the periphery of opening (22) with constitute between the top periphery of light flame mixing cavity (14) have with dense flame outlet (231) of dense flame mixing chamber (23) intercommunication.

2. The burner according to claim 1, wherein said plurality of air supply through holes (131) are arranged circumferentially in the radial direction of said light flame bypass duct (13).

3. The burner of claim 1, wherein the inner housing (100) is provided with a deflector located in the thin flame diversion channel (13) and directly opposite the air supply through-hole (131), the deflector extending obliquely in the direction of the air flow from the side of the air supply through-hole (131) remote from the air outlet of the thin flame diversion channel (13).

4. The burner of any one of claims 1 to 3, wherein two dense flame mixing cavity molds (21) are positioned at two opposite sides of the injection passage (11), and a plurality of dense flame shunting holes (12) communicated with the dense flame mixing cavity (23) are formed at two opposite side walls of the injection passage (11).

5. The burner of any one of claims 1 to 3, wherein two air supply channel molds (241) protruding outwards are further disposed on the housing (200), the two air supply channel molds (241) are enclosed to form an air supply channel body (24) enclosing the light flame diversion channel (13), an air inlet of the air supply channel body (24) is communicated with the atmosphere, and an air outlet of the air supply channel body (24) is communicated with the plurality of air supply through holes (131).

6. The burner of claim 5, characterized in that said inner casing (100) comprises two of said light flame split channels (13), said light flame mixing chamber (14) being provided with two air inlets; the two light flame shunting channels (13) are respectively arranged at two sides of the injection channel (11) and are connected with two air inlets of the light flame mixing cavity (14).

7. The low NOx burner of claim 6,

the air supply channel body (24) is provided with two air outlets which are positioned at two sides of the injection channel (11) and correspondingly communicated with a plurality of air supply through holes (131) of the two light flame diversion channels (13);

the air supply channel body (24) is provided with a ventilation gap to enclose the injection channel (11) and the light flame diversion channel (13), and is provided with three air inlets which are arranged in sequence, two air inlets positioned at the side parts are positioned at the two sides of the injection channel (11), and an air inlet positioned at the middle part surrounds the injection channel with a gap; or the like, or, alternatively,

the air supply channel body (24) encloses the light flame diversion channel (13) with a ventilation gap, and is provided with two air inlets which are positioned at two sides of the injection channel (11); or the like, or, alternatively,

the air supply channel body (24) encloses the injection channel (11) and the light flame diversion channel (13) with a ventilation gap, and is provided with an air inlet which surrounds the injection channel with a gap.

8. The low NOx burner of any one of claims 1 to 3, wherein a plurality of first convex hulls (232) protruding towards the lean flame mixing cavity (14) are arranged on the top side surface of the rich flame mixing cavity die (21) at intervals along the rich flame outlet (231);

a second convex hull (233) protruding towards the light flame mixing cavity (14) is further arranged in the middle of the side face of the thick flame mixing cavity die (21);

a third convex hull (144) is arranged on the inner wall of the light flame mixing cavity (14), and the third convex hull (144) is arranged corresponding to the air outlet end of the light flame diversion channel (13);

more than one fourth convex hull (145) is arranged on the side surface of the top of the light flame mixing cavity (14).

9. The burner of any of claims 1 to 3, wherein the inner housing (100) comprises a fire hole plate (18) provided at the light flame outlet (141), the fire hole plate (18) being provided with a light flame outlet (181); the fire hole plate (18) and the side wall forming the light flame mixing cavity (14) are of an integrated structure.

10. The burner of any one of claims 1 to 3, further comprising an inner core (300) disposed in the light flame mixing cavity (14), wherein the inner core (300) is provided with a plurality of gas flow channels (301) extending in a longitudinal direction, a bottom end surface of the gas flow channels (301) is provided with a gas inlet, and a top end surface of the gas flow channels (301) is provided with a gas outlet located at the light flame outlet (141).

11. A gas water heater comprising a low nox burner as claimed in any one of claims 1 to 10.

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